One-Step Synthesis Hydrogel Adhesive with Acid-Responsive Tannin-Releasing for Diabetic Oral Mucosa Defects Healing.

The complex preparation, weak wet tissue adhesion and limited biological activity of traditional oral wound dressings usually impede their efficient treatment and healing for diabetic oral mucosal defects. To overcome these problems, a novel hydrogel adhesive (named CFT hydrogel) was rapidly constructed using a one-step method based on dual-dynamic covalent cross-linking. Compared with the commercial oral patches, the CFT hydrogel showed superior in vivo (rat tongue) wet tissue adhesion performance. Additionally, the CFT hydrogel exhibited unique acid-responsive properties, thereby facilitating the release of bioactive molecule tannic acid (TA) in the acidic diabetic wound microenvironment. And a series of in vitro experiments substantiate the favorable biocompatibility and bioactivity properties (including antibacterial, antioxidative, anti-inflammatory, and angiogenetic effects) exhibited by CFT hydrogel. Moreover, in vivo experiments conducted on a diabetic rat model with oral mucosal defects demonstrated that the CFT hydrogel exhibited significant efficacy in protecting against mucosal wounds, alleviating inflammatory reactions, thereby facilitating the wound-healing process. Taken together, this study provided a promising and comprehensive therapeutic option with great potential for the clinical management of oral mucosa defects in diabetic patients. This article is protected by copyright. All rights reserved.